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matroskadec: Check for overflows in xiph lace decoding 

This also detects errors earlier

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-04-04 15:17:57 +02:00
parent 14de77d677
commit 115c3bc41f
1 changed files with 2 additions and 2 deletions
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4
libavformat/matroskadec.c
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@ -1992,18 +1992,18 @@ static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
uint32_t total = 0;
for (n = 0; res == 0 && n < *laces - 1; n++) {
while (1) {
if (size == 0) {
if (size <= total) {
res = AVERROR_INVALIDDATA;
break;
}
temp = *data;
total += temp;
lace_size[n] += temp;
data += 1;
size -= 1;
if (temp != 0xff)
break;
}
total += lace_size[n];
}
if (size <= total) {
res = AVERROR_INVALIDDATA;